NEC SP5008A - Manual (Page 43)

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3.2.4 Voice Setting
Jitter Buffer
Minimal Delay Specify the minimal delay of the jitter buffer. The range is
0~150 ms and the default setting is 0 ms.
Maximal Delay Specify the maximal delay of the jitter buffer. The range is
0~200 ms and the default setting is 200 ms.
OPTFactor Specify the dynamic jitter buffer frame error/delay optimization
factor, the range is 0~13.
VAD Enable/Disable the VAD (Voice Activity Detection) feature.
This is supported on all codecs that the FXS-FXO equips.
Echo cancellation Enable/Disable the echo cancellation feature. The default
setting is “Enable”.
Local voice volume Specify the volume gain of the voice in the local side (0~63,
default is 32). You can set this option for each of the 8 lines.
Remote receive volume Specify the volume gain of the voice in the remote side (0~63,
default is 32). You can set this option for each of the 8 lines.
DTMF volume Specify the volume gain of the DTMF (0~63, default is 27).